Fluid mechanics measurement based on the anisotropic core structure of pseudophase singularities in analytic signal representation of speckle pattern
Fluid mechanics measurement based on the anisotropic core structure of pseudophase singularities in analytic signal representation of speckle pattern
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DOI：
10.1117/12.725123
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发表时间：
2007-06
期刊：
影响因子：
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通讯作者：
Wei Wang;Mark R. Dennis;Reika Ishijima;Tomoaki Yokozeki;Akihiro Matsuda;S. Hanson;M. Takeda
中科院分区：
文献类型：
--
作者：
Wei Wang;Mark R. Dennis;Reika Ishijima;Tomoaki Yokozeki;Akihiro Matsuda;S. Hanson;M. Takeda
提出了一种流体力学测量新技术，该技术在拉盖尔-高斯滤波器操作生成的散斑图案的分析信号表示中利用伪相奇点。基于矢量波的偏振和复杂解析信号的梯度场之间的形式类比，一组类斯托克斯参数被应用于描述赝相奇点的各向异性核心结构，该结构作为随流移动的种子颗粒的独特指纹。流速和加速度测量的实验结果证明了所提出的光学涡旋计量学用于流体力学测量的有效性。
A new technique for fluid mechanics measurement is proposed that makes use of pseudophase singularities in an analytic signal representation of a speckle-like pattern generated by a Laguerre-Gauss filter operation. Based on the formal analogy between the polarization of the vector wave and the gradient field for the complex analytic signal, a set of Stokes-like parameters have been applied for the description of the anisotropic core structure of the pseudophase singularities, which serves as unique fingerprints attached to the seeding particles moving with the flow. Experimental results for flow velocity and acceleration measurement are presented that demonstrate the validity of the proposed optical vortex metrology for fluid mechanics measurement.